Building from source

The JDK version 1.6, JRuby 1.1.6 and Ragel 6.4 are needed to build this package.

After downloading a source package, you may need to configure the jruby.dir setting in nbproject/project.properties (defaults to ../jruby).
Ragel just needs to be in your path.
Then, from the source's directory, you may run ant to build a gemfile.

Differences from json

This gem does not include a graphical editor.

There are a few differences in corner cases, such as the strictness of certain parameters:
json will only accept Hashes, whereas json-jruby would accept anything that responds to to_hash.

For regular use, though, there are no practical differences between the libraries.